More falsehood. Bristlecone pines are considered to be the oldest living things on the planet, but none has been found to be older than 4500 years.
Carbon dating definately has not been calibrated, nor can it be, due to the obvious lack of an atmospheric sample from ancient times. It is known that the percentage of atmospheric 14 varies, but no pattern has ever been established.
Coyoteman been sippin the lobo juice?
More falsehood. Bristlecone pines are considered to be the oldest living things on the planet, but none has been found to be older than 4500 years.
Carbon dating definately has not been calibrated, nor can it be, due to the obvious lack of an atmospheric sample from ancient times. It is known that the percentage of atmospheric 14 varies, but no pattern has ever been established.
Coyoteman been sippin the lobo juice?
No falsehood. Its the standing dead trees that are important, not the living ones. If you date a living organism you don't get much of a date, as it is still ingesting Carbon-14.
By matching the tree-rings from the present backward you can establish the age of a particular ring on the dead trees. Then you can date that ring and establish a calibration curve.
Given the tree-rings you don't need an atmospheric sample.
This is what the new calibration curve is about:
A new calibration curve for the conversion of radiocarbon ages to calibrated (cal) ages has been constructed and internationally ratified to replace IntCal98 which extended from 0-24 ka cal BP (Before Present, 0 cal BP = AD 1950). The new calibration dataset for terrestrial samples extends from 0-26 ka cal BP but with much higher resolution beyond 11.4 ka cal BP than IntCal98. Dendrochronologically dated tree-ring samples cover the period from 0-12.4 ka cal BP. Beyond the end of the tree-rings, data from marine records (corals and foraminifera) are converted to the atmospheric equivalent with a site-specific marine reservoir correction to provide terrestrial calibration from 12.4-26.0 ka cal BP. A substantial enhancement relative to IntCal98 is the introduction of a coherent statistical approach based on a random walk model, which takes into account the uncertainty in both the calendar age and the radiocarbon age to calculate the underlying calibration curve.http://radiocarbon.pa.qub.ac.uk/calib/whatsnew.html
Flapddodle!
"The bristlecone pine chronology in the White Mountains currently extends back almost 9,000 years continuously. That's to 7,000 BC! Several pieces of wood have been collected that will extend this date back even further. The hope is to push the date back to at least 8,000 BC. This will be important as the last Ice Age ended about 10,000 years ago, and to have a record of this transition period would offer scientists a wealth of information."
http://www.sonic.net/bristlecone/dendro.html
due to the obvious lack of an atmospheric sample from ancient times.
Further flapdoodle!
Ice core data provides data about ancient atmospheric composition.
http://www.ldeo.columbia.edu/edu/dees/ees/climate/labs/vostok/
"'It has been calibrated against bristlecone pines going back some 11,500 years'"
Only in the circular reasoning of Darwinian scientists.